DOCSLIB.ORG

An Overview of the Multi-Purpose Elsa Flow Solver. L

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
An Overview of the Multi-Purpose Elsa Flow Solver. L An Overview of the Multi-Purpose elsA Flow Solver. L. Cambier, M. Gazaix, S. Heib, S. Plot, M. Poinot, J.P. Veuillot, J.F. Boussuge, M. Montagnac To cite this version: L. Cambier, M. Gazaix, S. Heib, S. Plot, M. Poinot, et al.. An Overview of the Multi-Purpose elsA Flow Solver.. Aerospace Lab, Alain Appriou, 2011, p. 1-15. hal-01182452 HAL Id: hal-01182452 https://hal.archives-ouvertes.fr/hal-01182452 Submitted on 31 Jul 2015 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. CFD Platforms and Coupling L. Cambier, M. Gazaix, S. Heib, S. Plot, M. Poinot, J.-P. Veuillot An Overview of the Multi-Purpose (Onera) J.-F. Boussuge, M. Montagnac (Cerfacs) elsA Flow Solver E-mail: [email protected] evelopment of the elsA software for complex external and internal flow Daerodynamics and multidisciplinary applications started in 1997 at Onera. Due to the multi-purpose nature of elsA, many common basic CFD features can be shared by a wide range of aerospace applications: aircraft, helicopters, turbomachinery, missiles, launchers… The elsA software is based on an Object- Oriented design method and on an Object-Oriented implementation based on three programming languages: C++, Fortran and Python. The elsA strategy for interoperability is based on a component approach that relies on standard interfaces for the CFD simulation components. This paper presents an overview of the capabilities of the elsA software in terms of modeling, mesh topology, numerics and boundary conditions, whereas a more detailed description of these capabilities is given in companion papers of this issue of the electronic journal. The importance of High Performance Computing activities is outlined in the present paper. Introduction large variety of the advanced aerodynamic applications handled by elsA is presented in [25]. Note that it is quite uncommon for a Unlike other industries, such as the automobile industry, the simulation CFD tool to deal both with external flows around airframes and with software used for aerodynamic analysis and design in the aeronautic internal flows in turbomachinery; since it allows common basic CFD industry is not usually provided by commercial software vendors, but is features to be shared, we clearly consider that it is an advantage. The generally developed either by Research Establishments or sometimes research, development and validation activities are carried out using a by the aeronautic industry itself. The overview of software tools used project approach in cooperation with the aircraft industry and external for flow simulation in the European aeronautic industry, presented in laboratories or universities (see Box 1). This project approach has [26], shows that in Europe they are mostly managed by Research been the result, at Onera as elsewhere, of the change in CFD software Establishments. One major reason for this is that the high levels of development from a one-code, one-developer paradigm at the accuracy and reliability required today for improving aeronautic design beginning of the eighties to a team-based approach necessary to cope are obtained through long term expertise and innovative research in with the complexity of today’s CFD. The effort carried out in France various areas: physical modeling, numerical methods, software and coordinated by Onera with elsA was also initiated approximately efficiency on rapidly evolving hardware and validation by comparison at the same time as projects in other countries, such as the WIND- with detailed experimental data. US flow solver of the NPARC Alliance [3] or the FAAST program at NASA Langley RC [19] in the United States or the TAU flow solver in The elsA software (http://elsa.onera.fr) for complex external and Germany [14]. internal flow aerodynamics and multidisciplinary applications has been developed at Onera since 1997 [4], [6]. The main objective is This paper gives a general presentation of the elsA solver, and to offer the French and European aerospace community a tool that mainly focuses on software topics such as Object-Oriented design capitalizes on the innovative results of Computational Fluid Dynamics and implementation, software interoperability or High Performance (CFD) research over time and is able to deal with miscellaneous Computing. Only a general overview of the capabilities of the elsA industrial applications. The range of aerospace applications dealt software in terms of modeling, mesh topology, numerics, aeroelasticity with using elsA (aircraft, helicopters, tilt-rotors, turbomachinery, and optimum design is presented here, whereas a more detailed counter-rotating open rotors, missiles, launchers, etc.) is very wide, description of these capabilities and results, showing evidence of as shown in figure 1 presenting a few examples of elsA results. A their functionality and correctness, is given in companion papers of Issue 2 - March 2011 - An Overview of the Multi-Purpose elsA Flow Solver 1 this issue of the electronic journal ([1] for transition and turbulence [22] for optimum design). Also, the reader should refer to another modeling, [8] for space discretization methods on various mesh companion paper [25] for a detailed presentation of the application topologies, [21] for time integration methods, [10] for aeroelasticity, results of elsA, which only appear in this paper as illustrations. p perturbation 4E-05 2E-05 0 -2E-05 -4E-05 P/(γPint) 0.68 0.69 0.7 0.71 0.72 a) Transport aircraft configuration: simulation of the flow around an aircraft with c) CROR configuration: simulation of the flow around a CROR for an aero- deployed spoilers acoustics study b) Turbomachinery configuration: simulation of the rotating stall in an axial d) Helicopter configuration: simulation of the interaction between the main rotor compressor stage and the fuselage Figure 1 – Examples of applications carried out with elsA Box 1 - Internal and external developers and users Many partners, not only inside Onera but also in external laboratories and universities and in the aerospace industry, contribute to the development of new capabilities and to the validation of elsA. Inside Onera, the CFD and Aeroacoustics Department of Onera coordinates the elsA software project and contributes to the development in terms of software architecture, numerical methods or CPU efficiency. Several other Departments take part in development and validation activities related to elsA software: namely the Applied Aerodynamics Department for thorough validation and some specific applied aerodynamics developments, the Aerodynamics and Energetics Modeling Department for transition and turbulence modeling and fundamental validation, and the Aeroelasticity and Structural Dynamics Department for fluid/structure capability development and validation. Since 2001, there has been a partnership with the Cerfacs research organization for elsA development, and Cerfacs has taken part in many developments, dealing, in particular, with mesh strategies, numerical methods and CPU efficiency, since that time. Other labs also take part in the development and validation of elsA, such as the Fluid Mechanics and Acoustics Lab of “École Centrale de Lyon” for development of complex turbomachinery boundary conditions, the applied research center Cenaero (Belgium) for turbomachinery flow simulation and the DynFluid lab of “Arts et Métiers ParisTech” for high accuracy numerical schemes. The use of elsA in French engineering schools or universities is also developing for academic teaching purposes. elsA is today intensively used as a reliable design tool in the French and European aeronautic industry. In turbomachinery industry, elsA is used in the design teams of Safran group (Snecma and Turbomeca in France, Techspace Aero in Belgium). For transport aircraft configurations, elsA is one of the two CFD programs used at Airbus for performance prediction and for design (the other one is the TAU software from DLR, see [5]). Among other industry partners, we should mention Eurocopter for helicopter applications and MBDA for missile configurations. Issue 2 - March 2011 - An Overview of the Multi-Purpose elsA Flow Solver 2 Why a multi-purpose tool for solving the Navier-Stokes larger and more complex simulations, and it has become increasingly equations? necessary to involve and combine several models and/or several meshing strategies in the same flow simulation. CFD methods and software have improved tremendously over the So, CFD software designers are faced with the challenge of meeting a last forty years. Whereas in the 1970s, CFD software for design very wide range of requirements, while keeping software complexity was mostly based on formulations assuming the flow to be inviscid, and development cost under control. Thus, a very broad range of today CFD codes solving the Navier-Stokes equations (see Box 2) CFD capabilities has to be grouped together in an interoperable and have become standard tools in the aeronautic industry [27]. The evolving software package. To cope with these broad requirements, improvements concern various areas:
Load more

Recommended publications
  • Introduction CFD General Notation System (CGNS)
    CGNS Tutorial Introduction CFD General Notation System (CGNS) Christopher L. Rumsey NASA Langley Research Center Outline • Introduction • Overview of CGNS – What it is – History – How it works, and how it can help – The future • Basic usage – Getting it and making it work for you – Simple example – Aspects for data longevity 2 Introduction • CGNS provides a general, portable, and extensible standard for the description, storage, and retrieval of CFD analysis data • Principal target is data normally associated with computed solutions of the Navier-Stokes equations & its derivatives • But applicable to computational field physics in general (with augmentation of data definitions and storage conventions) 3 What is CGNS? • Standard for defining & storing CFD data – Self-descriptive – Machine-independent – Very general and extendable – Administered by international steering committee • AIAA recommended practice (AIAA R-101A-2005) • Free and open software • Well-documented • Discussion forum: [email protected] • Website: http://www.cgns.org 4 History • CGNS was started in the mid-1990s as a joint effort between NASA, Boeing, and McDonnell Douglas – Under NASA’s Advanced Subsonic Technology (AST) program • Arose from need for common CFD data format for improved collaborative analyses between multiple organizations – Existing formats, such as PLOT3D, were incomplete, cumbersome to share between different platforms, and not self-descriptive (poor for archival purposes) • Initial development was heavily influenced by McDonnell Douglas’ “Common
    [Show full text]
  • Development of a Coupling Approach for Multi-Physics Analyses of Fusion Reactors
    Development of a coupling approach for multi-physics analyses of fusion reactors Zur Erlangung des akademischen Grades eines Doktors der Ingenieurwissenschaften (Dr.-Ing.) bei der Fakultat¨ fur¨ Maschinenbau des Karlsruher Instituts fur¨ Technologie (KIT) genehmigte DISSERTATION von Yuefeng Qiu Datum der mundlichen¨ Prufung:¨ 12. 05. 2016 Referent: Prof. Dr. Stieglitz Korreferent: Prof. Dr. Moslang¨ This document is licensed under the Creative Commons Attribution – Share Alike 3.0 DE License (CC BY-SA 3.0 DE): http://creativecommons.org/licenses/by-sa/3.0/de/ Abstract Fusion reactors are complex systems which are built of many complex components and sub-systems with irregular geometries. Their design involves many interdependent multi- physics problems which require coupled neutronic, thermal hydraulic (TH) and structural mechanical (SM) analyses. In this work, an integrated system has been developed to achieve coupled multi-physics analyses of complex fusion reactor systems. An advanced Monte Carlo (MC) modeling approach has been first developed for converting complex models to MC models with hybrid constructive solid and unstructured mesh geometries. A Tessellation-Tetrahedralization approach has been proposed for generating accurate and efficient unstructured meshes for describing MC models. For coupled multi-physics analyses, a high-fidelity coupling approach has been developed for the physical conservative data mapping from MC meshes to TH and SM meshes. Interfaces have been implemented for the MC codes MCNP5/6, TRIPOLI-4 and Geant4, the CFD codes CFX and Fluent, and the FE analysis platform ANSYS Workbench. Furthermore, these approaches have been implemented and integrated into the SALOME simulation platform. Therefore, a coupling system has been developed, which covers the entire analysis cycle of CAD design, neutronic, TH and SM analyses.
    [Show full text]
  • Integrated Tool Development for Used Fuel Disposition Natural System Evaluation –
    Integrated Tool Development for Used Fuel Disposition Natural System Evaluation – Phase I Report Prepared for U.S. Department of Energy Used Fuel Disposition Yifeng Wang & Teklu Hadgu Sandia National Laboratories Scott Painter, Dylan R. Harp & Shaoping Chu Los Alamos National Laboratory Thomas Wolery Lawrence Livermore National Laboratory Jim Houseworth Lawrence Berkeley National Laboratory September 28, 2012 FCRD-UFD-2012-000229 SAND2012-7073P DISCLAIMER This information was prepared as an account of work sponsored by an agency of the U.S. Government. Neither the U.S. Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness, of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. References herein to any specific commercial product, process, or service by trade name, trade mark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the U.S. Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the U.S. Government or any agency thereof. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy‘s National Nuclear Security Administration under contract DE-AC04-94AL85000. Integrated Tool Development for UFD Natural System Evaluation 9/1/2012 iii Integrated Tool Development for UFD Natural System Evaluation iv 9/1/2012 Integrated Tool Development for UFD Natural System Evaluation 9/1/2012 v Executive Summary The natural barrier system (NBS) is an integral part of a geologic nuclear waste repository.
    [Show full text]
  • Seven Keys for Practical Understanding and Use of CGNS
    Seven keys for practical understanding and use of CGNS Marc Poinot∗ Christopher L. Rumseyy SAFRAN NASA Langley Research Center [email protected] [email protected] We present key features of the CGNS standard, focusing on its two main elements, the data model (CGNS/SIDS) and its implementations (CGNS/HDF5 and CGNS/Python). The data model is detailed to emphasize how the topological user oriented information, such as families, are separated from the actual meshing that could be split or modified during the CFD workflow, and how this topological information is traced during the meshing process. We also explain why the same information can be described in multiple ways and how to handle such alternatives in an application. Two implementations, using HDF5 and Python, are illustrated in several use examples, both for archival and interoperability purposes. The CPEX extension formalized process is explained to show how to add new features to the standard in a consensual way; we present some of the next extensions to come. Finally we conclude by showing how powerful a consensual public approach like CGNS can be, as opposed to a stand-alone private one. All throughout the paper, we demonstrate how the use of CGNS could be of great benefit for both the meshing and CFD solver communities. I. Introduction The CFD General Notation System12 (CGNS) is a public standard for the CFD community. It has had more than 20 years of feedback from users throughout the world in industry, universities, and government research labs. The CGNS name is now well known in the CFD community, but it is often only associated with the CGNS library (CGNS/MLL) used by CFD tools.
    [Show full text]
  • Summary of Software Using HDF5 by Name (December 2017)
    Summary of Software Using HDF5 by Name (December 2017) Name (with Product Open Source URL) Application Type / Commercial Platforms Languages Short Description ActivePapers (http://www.activepapers File format for storing .org) General Problem Solving Open Source computations. Freely available SZIP implementation available from Adaptive Entropy the German Climate Encoding Library Special Purpose Open Source Computing Center IO componentization of ADIOS Special Purpose Open Source different IO transport methods Software for the display and Linux, Mac, analysis of X-Ray diffraction Adxv Visualization/Analysis Open Source Windows images Computer graphics interchange Alembic Visualization Open Source framework API to provide standard for working with electromagnetic Amelet-HDF Special Purpose Open Source data Bathymetric Attributed File format for storing Grid Data Format Special Purpose Open Source Linux, Win32 bathymetric data Basic ENVISAT Toolbox for BEAM Special Purpose Open Source (A)ATSR and MERIS data Bers slices and holomy Bear Special Purpose Open Source representations Unix, Toolkit for working BEAT Visualization/Analysis Open Source Windows,Mac w/atmospheric data Cactus General Problem Solving Problem solving environment Rapid C++ technical computing environment,with built-in HDF Ceemple Special Purpose Commercial C++ support Software for working with CFD CGNS Special Purpose Open Source Analysis data Tools for working with partial Chombo Special Purpose Open Source differential equations Command-line tool to convert/plot a Perkin
    [Show full text]
  • Getting Data Into Visit
    LLNL-SM-446033 Getting Data Into VisIt July 2010 Version 2.0.0 Brad Whitlock wrence La Livermore National Laboratory ii DISCLAIMER This document was prepared as an account of work sponsored by an agency of the United States government. Neither the United States government nor Lawrence Livermore National Security, LLC, nor any of their employees makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trade- mark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or Lawrence Livermore National Security, LLC. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or Lawrence Liver- more National Security, LLC, and shall not be used for advertising or product endorsement purposes. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory in part under Contract W-7405-Eng-48 and in part under Contract DE-AC52-07NA27344. iii iv Table of Contents Introduction Manual chapters . 2 Manual conventions . 2 Strategies . 2 Picking a strategy . 3 Definition of terms . 4 Creating compatible files Creating a conversion utility or extending a simulation . 7 Survey of database reader plug-ins. 9 BOV file format . 9 X-Y Curve file format. 12 Plain text ASCII files .
    [Show full text]
  • AIAA Paper 2012-1264
    AIAA-2012-1264 50th AIAA Aerospace Sciences Meeting, January 9 – 12, 2012, Nashville, TN Recent Updates to the CFD General Notation System (CGNS) Christopher L. Rumsey∗ NASA Langley Research Center, Hampton, VA 23681 Bruce Wedan† Computational Engineering Solutions, San Ramon, CA 94582 Thomas Hauser‡ University of Colorado Boulder, Boulder, CO 80309 Marc Poinot§ ONERA - The French Aerospace Lab, F-92322 Chatillon, FRANCE The CFD General Notation System (CGNS)—a general, portable, and extensible standard for the storage and retrieval of computational fluid dynamics (CFD) analysis data—has been in existence for more than a decade (Version 1.0 was released in May 1998). Both structured and unstructured CFD data are covered by the standard, and CGNS can be easily extended to cover any sort of data imaginable, while retaining backward compatibility with existing CGNS data files and software. Although originally designed for CFD, it is readily extendable to any field of computational analysis. In early 2011, CGNS Version 3.1 was released, which added significant capabilities. This paper describes these recent enhancements and highlights the continued usefulness of the CGNS methodology. Glossary of Terms ADF CGNS Advanced Data Format, www.grc.nasa.gov/www/cgns/CGNS docs current/adf API Application Programming Interface CGIO CGNS low-level library, www.grc.nasa.gov/www/cgns/CGNS docs current/cgio CHLone CGNS special purpose C library (for HDF5 files only), chlone.sourceforge.net CGNS CFD General Notation System, cgns.org CGNSTalk CGNS user forum,
    [Show full text]
  • BASEMENT Reference Manual
    BASEMENT System Manuals VAW - ETH Zurich v2.8.1 BASEMENT System Manuals VAW - ETH Zurich v2.8.1 Contents Preamble 5 Credits . 5 License ......................................... 7 1 Pre-Processing in QGIS with BASEmesh 11 1.1 Introduction . 11 1.2 Tutorial 1: Mesh Generation based on Pointwise Elevation Data . 12 1.2.1 Project Settings . 13 1.2.2 Coordinate Reference System Configuration . 14 1.2.3 Loading Input Data for Elevation Model . 14 1.2.4 Saving Layer as Shape File . 15 1.2.5 Loading the Model Boundary . 15 1.2.6 Editing the Model Boundary . 17 1.2.7 Loading Breakline Data . 19 1.2.8 Creation of the Elevation Model as TIN . 20 1.2.9 Adaption of the Breaklines for Quality Meshing . 21 1.2.10 Creation of Region Marker Points . 22 1.2.11 Creation of Quality Mesh . 24 1.2.12 Interpolating elevation data from elevation mesh (TIN) . 25 1.2.13 3D view of the mesh . 26 1.2.14 Export of mesh to 2dm . 27 1.3 Tutorial 2: Import/Modify an existing Mesh and use Raster Data as Elevation Model . 28 1.3.1 Importing a .2dm mesh file . 29 1.3.2 Modifying the material indices of elements . 29 1.3.3 Manual editing of mesh elements . 33 1.3.4 Renumbering the mesh . 34 1.3.5 Interpolating elevations from raster data . 35 1.4 Tutorial 3: Using dividing constraints along boundary cross sections and setting up a BASEMENT simulation with a mesh from BASEmesh . 35 1.4.1 Using dividing constraints for Quality meshing .
    [Show full text]
  • About Pycgns 3 1.1 CGNS Standard
    pyCGNS.intro/Manual Release 4.2.0 Marc Poinot August 27, 2007 CONTENTS 1 About pyCGNS 3 1.1 CGNS Standard...........................................3 1.2 Package contents...........................................4 1.3 Quick start..............................................5 2 Build and Install 7 2.1 Required libraries..........................................7 2.2 Optional libraries...........................................7 2.3 Installation process..........................................8 2.4 Single module installation......................................8 2.5 Configuration file contents......................................8 2.6 NAV depends.............................................9 2.7 MAP depends............................................9 2.8 WRA depends............................................9 3 Glossary 11 4 PDF Docs 13 i ii pyCGNS.intro/Manual, Release 4.2.0 Release 4.2 • CGNS.MAP is now a wrapper to CHLone python module • CGNS.WRA reborn, re-coding using Cython • CGNS.VAL reborn • completely new CGNS.NAV using Qt, VTK and Cython • YouTube demos here The package gathers various tools and libraries for CGNS end-users and Python application developpers. The main object of pyCGNS is to provide the application developpers with a Python interface to CGNS/SIDS, the data model. The MAP and PAT modules are dedicated to this goal: map the CGNS/SIDS data model the CGNS/Python implementation. The WRA module contains wrapper on CGNS/MLL and a MLL-like set of functions that uses the CGNS/Python mapping as implementation. The NAV module supports the CGNS.NAV graphical browser, with nice features about tree exploration, copy/paste and even global node changes. Then, the VAL module is a parser engine for CGNS/Python tree compliance checking. The CGNS.VAL tool can analyze your CGNS/HDF5 file and returns you a large panel of diagnostics.
    [Show full text]
  • MASS2, Modular Aquatic Simulation System in Two Dimensions, User
    PNNL-14820-2 MASS2 Modular Aquatic Simulation System in Two Dimensions User Guide and Reference W. A. Perkins M. C. Richmond September 2004 Prepared for the U.S. Department of Energy under Contract DE-AC06-76RL01830 DISCLAIMER United States Government. Neither the United States Government nor any agency thereof, nor Battelle Memorial Institute, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof, or Battelle Memorial Institute. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. PACIFIC NORTHWEST NATIONAL LABORATORY operated by BATTELLE for the UNITED STATES DEPARTMENT OF ENERGY under Contract DE-AC06-76RLO1830 Printed in the United States of America Available to DOE and DOE contractors from the Office of Scientific and Technical Information, P.O. Box 62, Oak Ridge, TN 37831-0062; ph: (865) 576-8401 fax: (865) 576-5728 email: [email protected] Available to the public from the National Technical Information Service, U.S. Department of Commerce, 5285 Port Royal Rd., Springfield, VA 22161 ph: (800) 553-6847 fax: (703) 605-6900 email: [email protected] online ordering: http://www.ntis.gov/ordering.htm This document was printed on recycled paper.
    [Show full text]
  • Data Formats for Visualization and I T Bilit Interoperability
    Data Formats for Visualization and Int eroperabilit y Steve Lantz Senior Research Associate 10/27/2008 www.cac.cornell.edu 1 How will you store your data? • Raw binary is compact but not portable – “Unformatted,” machine-specific representation – Byte-order issues: big endian (IBM) vs. little endian (Intel) • Formatted text is portable but not compact – Need to know all the details of formatting just to read the data – 1 byyygg()te of ASCII text stores only a single decimal digit (~3 bits) – Most of the fat can be knocked out by compression (gzip, bzip, etc.) – However, compression is impractical and slow for large files • Need to consider how data will ultimately be used – Are you trying to ensure future portability? – Will your favored analysis tools be able to read the data? – What storage constraints are there? 10/27/2008 www.cac.cornell.edu 2 Issues beyond the scope of this talk… • Provenance – The record of the origin or source of data – The history of the ownership or location of data – Purpose: to confirm the time and place of, and perhaps the person responsible for, the creation, production or discovery of the data • Curation – Collecting, cataloging, organizing, and preserving data • Ontology – Assigning t ypes and pro perties to data ob jects – Determining relationships among data objects – Associating concepts and meanings with data (semantics) •Portab le data fo rmats can an d do addr ess som e of th ese i ssues… 10/27/2008 www.cac.cornell.edu 3 Portable data formats: the HDF5 technology suite • Versatile data model that
    [Show full text]
  • Tutorial Session Agenda
    CFD General Notation System (CGNS) Tutorial Session Agenda • 7:00-7:30 Introduction, overview, and basic usage C. Rumsey (NASA Langley) • 7:30-7:50 Usage for structured grids B. Wedan (ANSYS – ICEM) • 7:50-8:10 Usage for unstructured grids E. van der Weide (Stanford University) • 8:20-8:40 HDF5 usage and parallel implementation T. Hauser (Utah State University) • 8:40-9:00 Python and in-memory CGNS trees M. Poinot (ONERA) • 9:00-9:30 Discussion and question/answer period 2 CFD General Notation System (CGNS) Introduction, overview, and basic usage Christopher L. Rumsey NASA Langley Research Center Chair, CGNS Steering Committee Outline • Introduction • Overview of CGNS – What it is – History – How it works, and how it can help – The future • Basic usage – Getting it and making it work for you – Simple example – Aspects for data longevity 4 Introduction • CGNS provides a general, portable, and extensible standard for the storage and retrieval of CFD analysis data • Principal target is data normally associated with computed solutions of the Navier-Stokes equations & its derivatives • But applicable to computational field physics in general (with augmentation of data definitions and storage conventions) 5 What is CGNS? • Standard for defining & storing CFD data – Self-descriptive – Machine-independent – Very general and extendable – Administered by international steering committee • AIAA recommended practice (AIAA R-101-2002) • In process of becoming part of international ISO standard • Free and open software • Well-documented • Discussion
    [Show full text]